Published December 1, 2025
| Version v1
Journal article
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New Source for QCD Axion Dark Matter Production: Curvature Induced
- 1. İstinye University, Faculty of Engineering and Natural Sciences, 34396, İstanbul, Türkiye
- 2. School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 69978, Israel
- 3. Department of Physics, The University of Osaka, Toyonaka, Osaka 560-0043, Japan
- 4. Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- 5. IFIC, Universitat de València-CSIC, C/ Catedràtico José Beltràn 2, E-46980, Paterna, Spain
Description
We discuss a novel mechanism for generating dark matter from a fast-rolling scalar field, relevant for both inflation and rotating axion models, and apply it specifically to the (QCD) axion. Dark matter comes from scalar field fluctuations generated by the product of the curvature perturbation and the fast-rolling background field. These fluctuations can explain the totality of dark matter in a vast axion parameter space, particularly for the QCD axion, which will be targeted by upcoming experiments. We review the constraints on this mechanism and potential gravitational-wave signatures.
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